"I'm lazy and non-chelont about life."
This may be where you find the reasons for having "no interest in God or your life".
Living in the monster of this world naturally causes an indifferent, hopeless attitude since every day you see all the evil around you affecting you and everyone else. You think it should all change but are overwhelmed by the magnitude of it all and then go hide away thinking you are so insignificant and useless to do anything, and wonder why God isn't changing everything yet either.
What I advise is you need to go and start doing rather than moping and worrying. When Jesus healed 10 lepers do you remember that only 1 returned to thank Him, but that did not stop Jesus from doing good things for others. He rains on the just and the unjust until the day of judgment.
What may help you also is to know that God has enabled you (if you are truly a believer in His atonement and His words found in the Bible) to actually affect other people's lives for good despite the hopelessness that is the natural feeling which goes against this.
Stop pondering your present hopeless feelings and the overwhelming magnitude of the evil all around in this world, and instead find things and ways that you can go out of your house and help other people even in the most simple way.
In giving what God has given to you to others you will find a reason to live again and a purpose to direct you for your future for the few years God may allow you to live on.
Many examples, commands, doctrines, directions are in the Bible free for you to read anytime. But the problem for many is not that they do not "know" the bible and its doctrines, they don't "do" the Bible as it were. You have to do what you know, because knowing is not enough. So go and do what you know. You don't have to "know" everything, in order to "do" something.
Also if you are truly a saved believer you cannot be demon possessed, but that does not mean you are still not free to give into your sinful nature or ideas from demons who still wish to affect your life so that you can then stay in a hopeless useless state where your life is not a threat to their agenda.
Once you start going out and finding more things to do to help other people physically and spiritually, you will become more and more disrespected by the masses, but you will also become more and more appreciated and respected by the few, and it is those few who you will remind yourself of all the time, those are the ones you will regain some more hope for living in. Seeing hope will give you hope, but you won't see hope unless you start giving more of your life to others in need.
"DO" ideas could be to volunteer or start a charity or Bible study, offer help to elderly or fatherless children, learn ways to share the Bible's commands with others, think of all skills and abilities you could give to help those more in need, etc.
Other things which may help is moving from your current environment, the monster of many areas or cities can bring to utter depression and indifference even the most strong Christian, do not underestimate what the lust and fear of wanting to live a western lifestyle can have on you physically and emotionally and spiritually.
If you can't escape a tormenting environment at this time, then a daily escape to a park or to visit Godly trusted friends can help bring you back to the hope filled state you can be restored to with God's mercy.
Lastly, beware of giving into any paranoia initiated into you from the words of heretics on so called Christian forums, most of which are filled with the most deranged heretics and dangerous statements that could ever affect your life if you give any heed to them.
Don't make things complicated for yourself, the examples and commands for life and eternity are found in the Bible, common sense reminds you of the rest. Go out and just go, along the way somewhere you will learn more and more as you do.
